Across
- 4. volcanic regions
- 6. formed by plates moving away from each other
- 10. causes earthquakes
- 11. a supercontinent
- 12. Boundaries causes island arcs
- 13. biggest layer of earth
- 15. the hottest part of the planet
Down
- 1. causes a rift valleys
- 2. when to plates converge and one is on top of the other
- 3. relatively low resistance of plastic flow
- 5. rigid outermost shell of the earth
- 7. the only liquid layer
- 8. composed of a variety of rocks
- 9. theory of earth outer shell is divided into several plates.
- 14. the mass per unit volume